How many types of OSPF packets are there? ()

A.

4

B.

5

C.

3

By default, what is the ForwarD.Delay time of the STP protocol in seconds? ()

A.

10

B.

15

C.

20

In the history of WLAN development, which of the following is not included in the main wireless protocol standards in the primary mobile office era? ()

A.

802.11g

B.

802.11a

C.

802.11b

D.

802.11ac

The last option field (option) of 1Pv4 is variable-length optional information. What is the
maximum length of this field? ()

A.

10B

B.

40B

C.

60B

D.

20B

Which of the following advantages does the single-arm routing approach achieve inter-
VLAN routing and intercommunication? ()

A.

Reduce the use of IP addresses

B.

Reduce the number of link connections

C.

Reduce routing table entries

The device port running the STP protocol is in the Forwarding state. Which of the following
statements are correct? ()

A.

This port port not only forwards user traffic but also processes BPDU packets

B.

This port only receives and processes BPDUs, and does not forward user traffic

C.

The port will construct a MAC address table based on the received user traffic, but does
not forward user traffic

D.

The port not only does not process BPDU packets, but also does not forward user traffic

What is the total length of the VLAN frame format defined by IEEE802.1Q? ()

A.

1

B.

2

C.

3

D.

4

When a company's network management needs to plan the network, the data packets that allow PC1 to access PC2 go through the G0/0/0 port (G0/0/2 on the picture). The data packet that PC2 accesses to PC1 goes from port G0/0/4 (G0/0/0 in the picture). () (Singlechoice question)

A.

10.0.12.5255.255.255.25511.0.12.6
#10.0.12.1255.255.255.25511.0.12.1

B.

10.0.12.5255.255.255.25511.0.12.210.
0.12.1255.255.255.25511.0.12.5

C.

0.0.0.00.0.0.00
#11.0.12.6
#11.0.12.10

D.

0.0.0.0
#0.0.0.0
0
#11.0.12.2
#11.0.12.50

Which of the following statements about the role of the STP protocol ForwarD.Delay is
correct? ()

A.

Prevent temporary loops

B.

There is a delay in the transition between Blocking state and DsiableD state

C.

Reduce the time interval of BPDu transmission and improve the convergence speed of
STP

D.

Improve the survival time of BPDUs to ensure that the configured BPDUs can be
forwarded to more switches

All the devices in the picture can communicate normally. Is the corresponding relationship between the MAC address table of $WA and the port correct? () (Single-choice question)

A.

MAC-AG0/0/2
MAC-BG0/0/2
MAC-CG0/0/3

B.

MAC-AG0/0/1
MAC-BG0/0/2
MAC-CG0/0/1

C.

MAC-A--GO/0/1
MAC-B--G0/0/1
MAC-C--GO/0/3

D.

MAC-A--GO/0/1
MAC-B-G0/0/2
MAC-C-GO/0/3